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Mezzanine and Shareholders' Equity - Summary of Stock Option Activity Under Black-Scholes Option (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended | 24 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Shares |  |  |  |  |  |  |  |  |
Options exercised (in shares) | (241,214) | (488,464) |  |  |  |  |  |  |
Weighted Average Remaining Contractual Term (Years) |  |  |  |  |  |  |  |  |
Options outstanding (term) | 5 years |  |  |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |
Beginning balance (in shares) | 607,346 | 647,240 | 1,141,040 | 0 | 647,240 | 607,346 | 647,240 | 1,141,040 | 0
Options assumed in the Merger (see Note 3) (in shares) |  |  | 1,141,040 |  |  |  |  |  |
Options granted (in shares) | 279,698 | 155,000 | 0 |  |  |  |  |  |
Options exercised (in shares) | (241,214) | (639,800) | 0 |  |  |  |  |  |
Options forfeited (in shares) | (78,378) | (9,000) | 0 |  |  |  |  |  |
Ending balance (in shares) | 607,346 | 647,240 | 1,141,040 | 0 | 647,240 |  |  |  |
Options exercisable (in shares) |  |  |  |  |  | 439,776 |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |
Beginning balance (in dollars per share) | $ 5.62 | $ 3.95 | $ 0.00 |  | $ 0.00 |  |  |  |
Options assumed in the Merger (see Note 3) (in dollars per share) |  |  | 3.95 |  |  |  |  |  |
Options granted (in dollars per share) | 17.24 | 9.85 | 0.00 |  |  |  |  |  |
Options exercised (in dollars per share) | 6.09 | 4.11 | 0.00 |  |  |  |  |  |
Options forfeited (in dollars per share) | 17.62 | 3.41 | 0.00 |  |  |  |  |  |
Ending balance (in dollars per share) | $ 9.22 | $ 5.62 | $ 3.95 | $ 0.00 | $ 5.62 |  |  |  |
Options exercisable (in dollars per share) |  |  |  |  |  | $ 4.58 |  |  |
Weighted Average Remaining Contractual Term (Years) |  |  |  |  |  |  |  |  |
Options outstanding (term) | 3 years 5 months 1 day | 4 years 1 month 16 days | 5 years 9 months 14 days | 0 years |  |  |  |  |
Options assumed in the Merger (see Note 3) (term) |  |  | 5 years 10 months 6 days |  |  |  |  |  |
Options exercisable (term) | 2 years 1 month 2 days |  |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |
Options outstanding |  |  |  |  |  |  | $ 9.2 | $ 22.6 | $ 0.0
Options assumed in the Merger (see Note 3) |  |  | $ 22.6 |  |  |  |  |  |
Options exercised | $ 2.7 | $ 9.8 |  |  |  |  |  |  |
Options exercisable |  |  |  |  |  | $ 5.6 |  |  |
Board Members |  |  |  |  |  |  |  |  |
Black-Scholes Option Pricing Model Assumptions: |  |  |  |  |  |  |  |  |
Expected term | 3 years |  |  |  |  |  |  |  |
Annual dividend yield | 0.00% |  |  |  |  |  |  |  |
Forfeiture rate | 0.00% |  |  |  |  |  |  |  |
Executives |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |
Ending balance (in dollars per share) | $ 18.91 |  |  |  |  |  |  |  |
Black-Scholes Option Pricing Model Assumptions: |  |  |  |  |  |  |  |  |
Expected term | 3 years |  |  |  |  |  |  |  |
Expected volatility rate | 84.42% |  |  |  |  |  |  |  |
Risk-free interest rate | 1.65% |  |  |  |  |  |  |  |
Market value of common stock |  |  |  |  |  | $ 18.91 |  |  |
Annual dividend yield | 0.00% |  |  |  |  |  |  |  |
Forfeiture rate | 0.00% |  |  |  |  |  |  |  |
Maximum | Board Members |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |
Ending balance (in dollars per share) | $ 18.11 |  |  |  |  |  |  |  |
Black-Scholes Option Pricing Model Assumptions: |  |  |  |  |  |  |  |  |
Expected volatility rate | 100.27% |  |  |  |  |  |  |  |
Risk-free interest rate | 2.51% |  |  |  |  |  |  |  |
Market value of common stock |  |  |  |  |  | 18.11 |  |  |
Minimum | Board Members |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |
Ending balance (in dollars per share) | $ 15.35 |  |  |  |  |  |  |  |
Black-Scholes Option Pricing Model Assumptions: |  |  |  |  |  |  |  |  |
Expected volatility rate | 90.50% |  |  |  |  |  |  |  |
Risk-free interest rate | 1.60% |  |  |  |  |  |  |  |
Market value of common stock |  |  |  |  |  | $ 15.35 |  |  |
Allied Pacific of California |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |
Beginning balance (in shares) | 0 | 853,800 | 853,800 | 1,910,400 | 853,800 | 0 | 853,800 | 853,800 | 1,910,400
Options granted (in shares) | 0 | 0 | 0 |  |  |  |  |  |
Options exercised (in shares) | 0 | 0 | (1,056,600) |  | (7,110,150) |  |  |  |
Options forfeited (in shares) | (853,800) | 0 | 0 |  |  |  |  |  |
Ending balance (in shares) | 0 | 853,800 | 853,800 | 1,910,400 | 853,800 |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |
Beginning balance (in dollars per share) | $ 0.167 | $ 0.167 | $ 0.167 |  | $ 0.167 |  |  |  |
Options granted (in dollars per share) | 0.000 | 0.000 | 0.000 |  |  |  |  |  |
Options exercised (in dollars per share) | 0.000 | 0.000 | 0.167 |  |  |  |  |  |
Options forfeited (in dollars per share) | 0.167 | 0.000 | 0.000 |  |  |  |  |  |
Ending balance (in dollars per share) | $ 0.000 | $ 0.167 | $ 0.167 | $ 0.167 | $ 0.167 |  |  |  |
Weighted Average Remaining Contractual Term (Years) |  |  |  |  |  |  |  |  |
Options outstanding (term) | 0 years | 9 months | 1 year 9 months | 2 years 9 months |  |  |  |  |
Options exercisable (term) | 0 years |  |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |
Options outstanding |  |  |  |  |  | $ 0.0 | $ 0.5 | $ 0.5 | $ 1.1
Options exercised |  |  | $ 0.6 |  |  |  |  |  |
Black-Scholes Option Pricing Model Assumptions: |  |  |  |  |  |  |  |  |
Expected term |  | 9 months |  |  |  |  |  |  |
Allied Pacific of California | Maximum |  |  |  |  |  |  |  |  |
Black-Scholes Option Pricing Model Assumptions: |  |  |  |  |  |  |  |  |
Expected term |  |  | 1 year 9 months |  |  |  |  |  |
Expected volatility rate |  | 41.60% | 41.60% |  |  |  |  |  |
Risk-free interest rate |  | 1.86% | 1.86% |  |  |  |  |  |
Market value of common stock |  |  |  |  |  |  | $ 0.76 | $ 0.76 |
Annual dividend yield |  | 3.53% | 3.53% |  |  |  |  |  |
Forfeiture rate |  | 6.80% | 6.80% |  |  |  |  |  |
Allied Pacific of California | Minimum |  |  |  |  |  |  |  |  |
Black-Scholes Option Pricing Model Assumptions: |  |  |  |  |  |  |  |  |
Expected term |  |  | 11 months 5 days |  |  |  |  |  |
Expected volatility rate |  | 38.10% | 38.10% |  |  |  |  |  |
Risk-free interest rate |  | 1.64% | 1.64% |  |  |  |  |  |
Market value of common stock |  |  |  |  |  |  | $ 0.52 | $ 0.52 |
Annual dividend yield |  | 2.23% | 2.23% |  |  |  |  |  |
Forfeiture rate |  | 0.00% | 0.00% |  |  |  |  |  |

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